CNC Rear Sprocket & Chain Adjusters
Precision-engineered for durability and flawless alignment. Built to handle years of use without losing accuracy.
Sales & Support: 01664 498 640
Product Code: PC460C46
M2R RS-R 300 21/18 96cm Black/Grey Race Spec Dirt Bike In Stock
£2495.00
Delivery
Click & Collect
Spread the Cost on Orders Over £100
Simply add your products & services to the basket, then continue through the checkout as normal. On the confirmation page, when you are prompted to “Pay Now” select the “Flexible Finance” option to proceed to the application screen.
Only 5 minutes to complete with an instant decision! Finance is available when spending over £100 View T&C's
Representative example
Newday Ltd. UK only. 18+ Credit and offer subject to status. T&Cs apply
This bike requires assembly
Our products are easy to assemble, and we offer guides, videos and a telephone service to help you. However, if you would rather we do it, we will assemble, test and do a full inspection and deliver “ready to ride!”.
Click to add the assembly fee (£125.00) or click Continue to receive the item flat packed.
In Action: M2R RS-R 300 | 2026 Enduro BEAST!!
360 Preview: 2026 M2R RSR 300 Is a Different Animal
360 Preview: Starting 2026 With the Best | M2R RS-R 300
The RS-R 300 Twins
M2R RS-R 300 — Built to Hit HarderForget “entry-level.” The RS-R 300 is a full-fat, water-cooled weapon that out-punches typical 300-class trail bikes with real race hardware and big-bike ride feel. Smooth, torquey power. The Zongshen NB300 single (4-valve, SOHC, balance shaft) is fed by a Nibbi PWK34 Sports carb for instant snap. Hit the button—electric start with lithium battery—and go. Final drive is tough #520 chain with 13/52 gearing to keep you in the meat of the torque. Chassis you can trust. A high-strength cradle frame and alloy integrated swingarm carry a 54/60 mm adjustable USD fork (310 mm stroke) and a tuned rear shock for planted traction. 7116-alloy 21/18 rims wearing M2R soft-compound tyres plus serious stopping from a 260 mm wave front disc with dual-piston caliper and a 220 mm rear, keep the pace hot and controlled.
Pro-grade touches (this stuff really matters)
CNC HubsBillet aluminum hubs for ultimate strength, perfect balance, and smoother handling. Lightweight, tough, and built to take serious punishment. 
CNC FootpegsCNC-machined for strength, grip, and control. Lightweight, wide, and ultra-tough — built to keep you planted in any terrain. 
Front & Rear Disc GuardsSerious brake protection when the trail turns brutal — keeps your discs safe from rocks, roots, and ruts. 
Lower Engine ProtectorGo full send without the bend. Heavy-duty protection for the heart of your machine. 
Hand GuardsYour first line of defense — protects levers and knuckles from trees, stones, and trail carnage. 
M2R Racing Muffler with “Mega-Boom” Exhaust NotePerformance-tuned for a deep, purposeful sound that commands attention and delivers serious flow. 
KTM-Look Rally HeadlightSharp, modern styling inspired by rally heritage — built for visibility and trail cred. 
Motorcycle Timer (Hour Meter)Stay on top of maintenance with precision. Know exactly when it’s time for your next service.
Fast facts
The RS-R 300 isn’t just “another 300”—it’s a tougher, sharper, water-cooled step up with real race-spec details that riders feel from the first twist to the last lap.
Just for reference, we find this is most commonly purchased for ages 16+. Height, Weight & Skill should also be considered.
SupportWe offer a full support service with FREE lifetime telephone technical advice and stock standard & performance parts. Servicing & Maintenance checks are also available - Call for details. 
AssemblyAs standard, this model requires partial assembly. Approx. 120 minutes. Please see our example assembly videos for more information. This vehicle is shipped with transport oil only. An oil change must be completed before any use. 
WarrantyStandard 30 Days Full Cover / 6 Month Manufacturing Defect Warranty (Excludes Consumable Items). Limitations – Any modification, use of noncertified accessories, water ingress, misuse or incorrect assembly, lack of or incorrect maintenance, incorrect parts installation, or collision damage, will invalidate the warranty. Commercial use is prohibited. 
AdviceA mechanically able person will be required to carry out the assembly and long-term maintenance of this product. Maintenance will be required to service the engine and fit parts to this product as usage requires. Please consider these requirements before purchasing the item. We do offer a FREE support line where our mechanics will diagnose problems and help you source any required parts, but you will be required to fit those parts and assist in the diagnosis. |
| Boxed Dimensions | L161cm x W46cm x H86cm |
| Brakes | Disc Brakes |
| Built Dimensions | L219cm x W54cm x H132cm |
| Carburettor | NIBBI / PWK34 |
| Colour | Black |
| Colour | Grey |
| Cooling | Water Cooled |
| Engine Oil | SAE 10W-40 |
| Engine Spec | 4 Stroke - Single Cylinder |
| Engine Type | Petrol Engine |
| Frame | Chromoly Steel |
| Fuel | Unleaded |
| Fuel Capacity | 9.0 Litres |
| Gross Weight | 140 Kg |
| Ground Clearance | 31cm |
| Max Rider Weight | 175 Kg |
| Motor Size | 300cc |
| Net Weight | 119 Kg |
| Rim Size | F: 21 inch - R: 18 inch |
| Seat Height | 96cm |
| Start Type | Electric Start |
| Suitability | Guide 16+ At Parents Discretion - Height, Weight & Skill should be considered |
| Terrain | Full Off Road |
| Throttle Type | Twistgrip |
| Tyres | MX tread |
| Warranty | 30 Days Full Cover / 6 Months Manufacturing Defects (Excludes Consumable Items) |
* Product specifications are subject to change without notice and may vary from those shown. Errors and omissions excepted.
You can view your estimated delivery time & charges by either clicking the “Check Delivery Charges & Time” button, or by using the “Confirm Delivery Charges & Time” button in the checkout. Estimates for your delivery charges and the receipt of your goods will be confirmed in the checkout process.
1. Dispatch of Your Order
1.1 All goods are subject to availability.
1.2 Items ordered will be delivered as soon as possible in accordance with the requested delivery service. All delivery charges are shown for items in stock to U.K. mainland addresses only. If you require delivery to non-U.K. mainland address charges will vary depending upon the destination. Please contact us to discuss your requirements.
1.3 We will try to ensure that delivery is made within the estimated time scales.
1.4 Items ordered for collection using Click & Collect will be prepared as soon as possible. Communications will be sent by Email and Text to confirm the item is ready for collection with an expected collection time by the buyer of up to 7 days post confirmation the item is ready to collect.
1.5 For products listed on our Web Site outstanding orders can be cancelled at any time. In instances where payment has already been made, an alternative or refund in full for the item(s) concerned will be given.
2. Delivery
2.1. You should check your order carefully when it is delivered to you. In the event of any goods delivered by us being damaged in transit, or failing to match the items ordered by you, then you should notify us promptly. We use independent couriers in order to deliver goods to you a quickly and efficiently as possible. We need to hear from you as soon as possible if you believe that your order has been damaged in transit so that we can investigate the matter with our couriers.
2.2. Any product with free delivery will only include the free service within mainland England. And the items will be sent by economy service and can take up to 7 working days.
3. Returns and Exchanges
CANCELLATION AND RETURNS POLICY ONLINE AND OVER THE PHONE ONLY
We want you to be entirely satisfied with every purchase made from us and we aim to offer you excellent quality, value and service at all times.
3.0 If you wish to cancel your order:
3.1 You can contact us via email at cs@funbikes.co.uk or phone on 01664 498 640 and quoting your order reference number.
3.2 You can notify us of your wish to return the goods to us for a full refund or exchange within the first 14 days of receipt, and a further 14 days are given for the goods to be received at our address. Preferably, the goods should be in the original packaging. The cost of returning the item is yours to bear.
3.3 Once we have received the item/s back you will receive a full refund or an exchange for credit for the amount paid. All refunds will be repaid into the same account from which payment was made.
3.4 The rights to return your items will not arise if the item/s have been used, damaged, modified or broken. This statement does not affect your statutory rights.
3.5 If any item is returned to us in a non-saleable condition, we have the right to reduce your refund up to the full purchase price.
3.6 Faulty or Damaged Goods: Online, Phone and Store Purchases.
3.7 You take full responsibility on receipt of the items you have ordered. Please contact us as soon as possible if any damage, fault occurs with your item within your warranty period. We may ask you to provide a picture of the damage via email. We will look at sending a replacement part to fix the issue but if a part will not resolve the problem then we will offer a return of the vehicle for a fix. A replacement/refund if deemed damaged beyond repair. A refund will not be offered on any assembly, misuse or wear and tear on the item. Please note that if a replacement is given this may be a refurbished item if the vehicle returned is used.
2-stroke engines produce more torque at higher RPM and are light and powerful.
4-stroke engines have more torque at lower RPM, are heavier, quieter and very efficient and durable.
We offer an assembly service on selected products. "Add Assembly" includes a complete build, test ride and pre-delivery inspection of the item, and we will deliver your vehicle "Ready to Ride!"
Adding assembly may affect your delivery price and despatch estimate as we will automatically upgrade your order to a premium network service.
You may choose assembly by ticking the "Add Assembly" option on the product page or the X under Assembly in the checkout.
All of our Pit Bikes use inner tubes but a lot of our other vehicles are tubeless. As a rough guide, hub motors tend to be tubeless, and split rims tend to be tubed.
Generally, if you can see a 'car style' valve on your rim, your wheel is likely tubeless. If the valve has movement and looks like a push bike valve, it is likely tubed.
All our products come with a warranty. The warranty will vary dependent on the model. For specific information, click the "DESCRIPTION" tab and scroll to "Warranty" at the bottom of the page.
We strongly recommend using E5 "Super Grade" (97+ Octane) petrol only in our vehicles.
E5 has less Ethanol than E10, and although E10 is suitable for vehicles used regularly, it may cause maintenance issues in vehicles used infrequently.
At 10% Ethanol, the E10 fuel will age, degrade and split faster if left in the tank or carburettor or stored than E5 and is also more corrosive on vehicle parts.
If a vehicle is unused for an extended period, the most likely cause of not starting is the petrol. With the recent addition of Ethanol, petrol only has a 3-6 months shelf life, and you can expect approximately three weeks at summer temperatures in a vented fuel tank. After this time, the performance will suffer.
As petrol ages, it will change noticeably in colour, smell, and viscosity. Running your vehicle with aged fuel will cause hard starts, poor performance and gums may cause blocks in the carburettor and plug fouling.
We strongly recommend that you use or drain the fuel before storing your vehicle for an extended period.
Before looking for failing components or setup issues, replace the petrol in the tank, and if necessary, empty, check and clean the carb.
We keep OEM & performance spares for our products in stock.
Free lifetime technical support is offered on our products by phone and in our "Online Support Centre" You may talk to our mechanics for help and advice and login for support & info about your purchases.
Our products are not legal for road use in the UK unless "Road Legal" is in the product description. The rider is responsible for following the laws and that adequate safety equipment is worn.
We offer Free, Economy, Express, or Saturday Delivery options depending on your location. To confirm what options are available for your item, view charges, and an estimate for your item's receipt, click the "Check Delivery Charges & Time" button on the product or the Checkout page and enter your postcode.
2-Stoke engines - Semi-Synthetic 2-stroke Oil.
4-Stroke engines - Semi-Synthetic 4-stroke Oil 10W-40.
